Table 3. Efficacy comparison.

HHS: Harris Hip Score, WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index

Study	Pain reduction	Functional improvement
Villanova-López et al. [11]	Significant at 12 months (P < 0.01)	Significant at 12 months (HHS and WOMAC, P < 0.01)
Di Sante et al. [12]	Significant at 4 weeks (P < 0.01); No significance at 16 weeks (P > 0.05)	No significant improvement at 4 or 16 weeks (WOMAC, P > 0.05)
Dallari et al. [13]	Significant at all follow-ups, greatest at 6 months (P < 0.0005)	Significant at 2 and 6 months (WOMAC); Not significant at 12 months (P > 0.05)
Nouri et al. [14]	Significant at all follow-ups (P < 0.01)	Significant at all follow-ups (WOMAC and Lequesne, P < 0.01)
Doria et al. [15]	Significant at 6 and 12 months (P < 0.01)	Significant at 6 and 12 months (HHS and WOMAC, P < 0.01)